Don't know much about diesels, but if we are talking about the same cam belt
tensioner that is used on the gas models, then the one with the holes is the
updated one.  VW switched around '82 or so and Schley makes a really nice
tool.  If we are talking about something else, then just ignore my babbling.

Scott
'82 FrankenWesty

>Or you could just upgrade your tensioner pulley to a newer one that has the
>flats on it so you can use a wrench to tension it.  That way you get a new
>tensioner pulley (didn't you always want one anyway) and don't have to buy
a
>special tool or do wierd things with nails or small allen keys (like I do)
in
>order to tension your timing belt.
>Just an idea.
>Ken Wilford
>Van-Again
>John 3:16